Richard had put the cat in attic since the cat made a lot of noise during the time he wanted to sleep so solving his problem was to put the cat in the attic and then he got to sleep in peace and quite
Juan Thomas means when he says "the structure" is that the poor people are cheated from birth, but they made it through it. He is scared for Kino. It is important to the story because it foreshadows the things that happen to Kino.